<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <div id="app">
        <div>
            <p>请选择你要购买的书籍</p>
            <ul v-for="(item,index) in arr" :key="index">
                <li>{{item.name}}<button @click="a(index)">买书</button></li>

            </ul>
            <table border="1" width="500" cellspacing="0">
                <tr>
                    <th>序号</th>
                    <th>书名</th>
                    <th>单价</th>
                    <th>数量</th>
                    <th>合计</th>
                </tr>
                <tbody>
                    <tr v-for="(item,index) in arr" :key="index">
                        <td>{{index+1}}</td>
                        <td>{{item.name}}</td>
                        <td>{{item.price}}</td>
                        <td>{{item.count}}</td>
                        <td>{{item.price*item.count}}</td>
                    </tr>
                </tbody>
            </table>

            <p>总价格为: {{totalAmount}}</p>
        </div>
    </div>
    <script src="../vue.js"></script>
    <script>
        const app = new Vue({
            el: '#app',
            data: {
                arr: [
                    { name: "水浒传", price: 107, count: 0 },
                    { name: "西游记", price: 192, count: 0 },
                    { name: "三国演义", price: 219, count: 0 },
                    { name: "红楼梦", price: 178, count: 0 }
                ],
                totalAmount: 0,

            },
            methods: {
                a(index) {
                    this.arr[index].count++;
                    this.calculateTotal();
                },
                calculateTotal() {
                    let sum = 0;
                    for (let book of this.arr) {
                        sum += book.price * book.count;
                    }
                    this.totalAmount = sum;
                }
            },
            mounted() {
                this.calculateTotal(); // 初始化时计算一次总价
            }
        }
        )
    </script>
</body>

</html>